Device for feeding band material

Claim 1

A DEVICE FOR ADVANCING A STRIP TO BE CLIPPED INTO SHEETS OF EQUAL SIZE COMPRISING A KNIFE MOUNTED ON A ROTATABLE SHAFT ADAPTED TO BE DRIVEN BY A MOTOR, DRIVING MEANS FOR ADVANCING THE STRIP RELATIVE TO THE SPEED OF SAID KNIFE CLIPPING THE STRIP INTO SHEETS, WHEREBY THE SHEET SIZE AND SIZE ACCURACY IS DETERMINED BY THE SPEED AT WHICH SAID DRIVING MEANS IS OPERATED, SAID DRIVING MEANS INCLUDING AT LEAST ONE FEEDING ROLL, A DIFFERENTIAL CONNECTED TO THE SHAFT OF SAID FEEDING ROLL, FIRST TRANSMISSION MEANS ADATPED TO TRANSFER A CONTINUOUS DRIVING FORCE FROM SAID MOTOR TO SAID DIFFERENTIAL, SECOND TRANSMISSION MEANS COMPRISING A VARIATOR AND A COUPLING, WHICH ARE CONNECTED IN SERIES, ELECTROMAGNETIC CONTROL MEANS FOR SAID COUPLING; SAID SECOND TRANSMISSION MEANS CONNECTED IN PARALLEL WITH SAID FIRST TRANSMISSION MEANS BETWEEN SAID MOTOR AND SAID DIFFERENTIAL WHEREBY THE DRIVING SPEED TO SAID FEEDING ROLL IS COMPOSED OF THE DRIVING SPEEDS OF SAID FIRST AND SECOND TRANSMISSION MEANS, THE DEVICE ALSO COMPRISING A CONTROL ARRANGEMENT PROVIDED WITH A SENSING ARRANGEMENT SENSITIVE TO INDICATING MEANS ON THE STRIP AND CAM OPERATED CONTACTS AND A SWITCH CONTROLLED IN TIME WITH THE ROTATION OF SAID KNIFE; SAID CONTROL ARRANGEMENT ADAPTED, WHEN SIGNALS OF SAID SENSING ARRANGEMENT AND SAID SWITCH, RESPECTIVELY, ARE COINCIDENT, TO SUPPLY CURRENT TO SAID ELECTROMAGNETIC CONTROL MEANS FOR UNCOUPLING SAID COUPLING UPON OPERATION OF SAID CAM OPERATED CONTACTS CONTROLLED BY THE ROTATION OF SAID KNIFE, AND AFTER A PREDETERMINED PERIOD DETERMINED BY SAID CAM OPERATED CONTACTS TO RECOUPLE SAID COUPLING.

Claim 2

A DEVICE FOR ADVANCING A STRIP TO BE CLIPPED INTO SHEETS OF EQUAL SIZE COMPRISING A KNIFE MOUNTED ON A ROTATABLE SHAFT ADAPTED TO BE DRIVEN BY A MOTOR, DRIVING MEANS FOR ADVANCING THE STRIP RELATIVE TO THE SPEED OF SAID KNIFE CLIPPING THE STRIP INTO SHEETS, WHEREBY THE SHEET SIZE AND SIZE ACCURACY IS DETERMINED BY THE SPEED AT WHICH SAID DRIVING MEANS IS OPERATED, SAID DRIVING MEANS INCLUDING AT LEAST ONE FEEDING ROLL, A DIFFERENTIAL CONNECTED TO THE SHAFT OF SAID FEEDING ROLL, FIRST TRANSMISSION MEANS ADATPED TO TRANSFER A CONTINUOUS DRIVING FORCE FROM SAID MOTOR TO SAID DIFFERENTIAL, SECOND TRANSMISSION MEANS COMPRISING A VARIATOR AND A COUPLING, WHICH ARE CONNECTED IN SERIES, ELECTROMAGNETIC CONTROL MEANS FOR SAID COUPLING; SAID SECOND TRANSMISSION MEANS CONNECTED IN PARALLEL WITH SAID FIRST TRANSMISSION MEANS BETWEEN SAID MOTOR AND SAID DIFFERENTIAL WHEREBY THE DRIVING SPEED TO SAID FEEDING ROLL IS COMPOSED OF THE DRIVING SPEEDS OF SAID FIRST AND SECOND TRANSMISSION MEANS, THE DEVICE ALSO COMPRISING A CONTROL ARRANGEMENT PROVIDED WITH A SENSING ARRANGEMENT SENSITIVE TO INDICATING MEANS ON THE STRIP AND CAM OPERATED CONTACTS AND A SWITCH CONTROLLED IN TIME WITH THE ROTATION OF SAID KNIFE; SAID CONTROL ARRANGEMENT ADAPTED, WHEN SIGNALS OF SAID SENSING ARRANGEMENT AND SAID SWITCH, RESPECTIVELY, ARE COINCIDENT, TO SUPPLY CURRENT TO SAID ELECTROMAGNETIC CONTROL MEANS FOR UNCOUPLING SAID COUPLING UPON OPERATION OF SAID CAM OPERATED CONTACTS CONTROLLED BY THE ROTATION OF SAID KNIFE, AND AFTER A PREDETERMINED PERIOD DETERMINED BY SAID CAM OPERATED CONTACTS TO RECOUPLE SAID COUPLING.